what is a movie screen made of

 　　Movies are played by projecting them onto a screen using a movie projector. In pursuit of a better movie viewing experience, movie screens are constantly being updated, from white walls, white cloths to screens, to giant screens and dome screens, and the cost is getting higher and higher. Many screens can be worth hundreds of thousands of dollars.

　　To make a screen that satisfies the audience experience, there are many factors to consider, the first is the visual effect - gain.

　　Gain is a unit of measure that measures the strength of screen reflections. At present, most cinemas on the market will choose a screen with a gain of 1.4-1.8, because the screen with a gain in this range has a better visual effect, and the light can be focused into a concentrated pattern, and the focused pattern is bright and uniform, which can satisfy the audience's view. film needs.

　　The second is sound transmission. To optimize the transmission of sound, one structure is crucial - the sound-transmitting hole. In order to ensure the sound effect, generally cinemas will set up three speakers on the left, center and right behind the screen. The sound from the speakers is transmitted to the audience through the tens of thousands of sound-transmitting holes densely covered on the screen, giving people an immersive experience. a feeling of.

　　The last is the choice of material. The screen material of the cinema is generally made of polyethylene film, which is covered with a thin layer of magnesium carbonate. Magnesium carbonate has a good reflection effect, does not absorb light, and has an excellent visual effect. In addition to the polyethylene film mentioned above, the screen materials on the market include white plastic, glass beads and metal curtains.

　　Among them, compared with other screens, the metal screen can not only overcome a series of disadvantages such as indistinct black and white and unclear images, but also meet higher movie viewing needs, such as showing 3D movies.

　　Although it is called "metal curtain", it is not as hard as metal. The metal curtain used in cinemas is covered with a thin layer of metal powder. Touching it will cause the metal powder to fall off and accelerate the oxidation of the metal powder, thereby damaging it. Screen. Moreover, the metal curtain is a whole, which can neither be partially repaired nor partially replaced. Once damaged, the entire curtain can only be replaced.